US2024219290A1PendingUtilityA1
Simulation equipment for hot and humid marine environment and radiation intensity prediction method thereof
Assignee: CHINA NATIONAL ELECTRIC APPARATUS RES INSTITUTE CO LTDPriority: Sep 17, 2021Filed: Mar 12, 2024Published: Jul 4, 2024
Est. expirySep 17, 2041(~15.1 yrs left)· nominal 20-yr term from priority
G01N 17/002G01R 31/003G01N 17/004G01N 17/00
52
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Claims
Abstract
A simulation equipment for hot and humid marine environment and radiation intensity prediction method thereof, which can simultaneously load the working environment factors including voltage, current, temperature, humidity, salt spray, and UV radiation for the tested electrical equipment. The radiation intensity prediction method can predict the UV radiation intensity at the target position of the tested electrical equipment under the influence of different temperature and humidity and salt spray concentration on the attenuation of UV light radiation, so as to accurately obtain the UV radiation intensity q t at the target position of the tested electrical equipment during material corrosion and aging tests. Moreover, the UV radiation intensity q t at the target position of the tested electrical equipment can be adjusted to the target UV radiation intensity by correspondingly enhancing or weakening the luminous intensity of each UV fluorescent lamp tube.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A simulation equipment for a hot and humid marine environment, comprising a dry salt spray generation device, a humidifier, a salt spray generation chamber, a main test chamber, and a temperature and humidity regulation system, the dry salt spray generation device is capable of delivering micro-nano scale sodium chloride dry salt particles into the salt spray generation chamber, the humidifier is capable of delivering moist air into the salt spray generation chamber, a centrifugal fan is installed in the salt spray generation chamber, and an outlet of the centrifugal fan is connected to an air inlet of the main test chamber, and the air inlet is located at an upper part of a side wall of the main test chamber;
an interior of the main test chamber is equipped with multiple UV fluorescent lamp tubes and a power interface for supplying power to a tested electrical equipment, each UV fluorescent lamp tube is located at the upper part of the side wall of the main test chamber, and each UV fluorescent lamp tube is arranged in parallel to each other, and a coplanar surface of each UV fluorescent lamp tube is parallel to a bottom surface of the main test chamber; the temperature and humidity regulation system can monitor and regulate the air temperature and humidity inside the main test chamber.
2 . The simulation equipment for the hot and humid marine environment according to claim 1 , further comprising two salt spray concentration monitors, a laser particle sensor, a first light intensity sensor for detecting parallel oriented UV light, and a second light intensity sensor for detecting scattered UV light, which are installed in the main test chamber; the two salt spray concentration monitors are respectively located at a top of the side wall of the main test chamber and a bottom of the side wall of the main test chamber, the laser particle sensor is located on a side of the air inlet, the first light intensity sensor and the second light intensity sensor are both mounted on an inner top surface of the main test chamber, a distance between the first light intensity sensor and the coplanar surface of each UV fluorescent lamp tube is within 3 cm, and a distance between the second light intensity sensor and the coplanar surface of each UV fluorescent lamp tube is within 3 cm.
3 . The simulation equipment for the hot and humid marine environment according to claim 2 , further comprising an electrical control cabinet, which is electrically connected to the dry salt spray generation device, the humidifier, the temperature and humidity regulation system, the centrifugal fan, the UV fluorescent lamp tubes, the salt spray concentration monitors, the laser particle sensor, the first light intensity sensor, and the second light intensity sensor.
4 . The simulation equipment for the hot and humid marine environment according to claim 3 , wherein the salt spray generation chamber and the main test chamber are equipped with sealing doors that can be opened and closed.
5 . The simulation equipment for the hot and humid marine environment according to claim 2 , wherein a bottom of the main test chamber is equipped with an air outlet and a drainage outlet.
6 . A radiation intensity prediction method for a hot and humid marine environment simulation equipment, wherein it is implemented based on the simulation equipment for the hot and humid marine environment according to claim 2 , comprising:
Step S 1 , after a difference in salt spray concentration values measured by the two salt spray concentration monitors is within 10%, measuring an air temperature T and a relative humidity RH inside the main test chamber by the temperature and humidity regulation system; measuring a size distribution data of salt spray droplets by the laser particle sensor within a sensing range, the size distribution data of the salt spray droplets includes a number of the salt spray droplets N i within a radius range of an i-th salt spray droplet in a radius of the sensing range, 1≤i≤K, K is a positive integer; measuring a parallel UV light intensity I inc dir by the first light intensity sensor, and measuring a scattered UV light intensity I inc dif by the second light intensity sensor; Step S 2 , performing conversion calculations, comprising: Step S 2 - 1 , calculating a volume fraction f v of the salt spray droplets occupying the internal space of the main test chamber at the air temperature T and relative humidity RH using the following formulas:
C NaCl =2.37×10 −4 T·RH−0.2237RH−0.0237T+22.37, in this formula, C NaCl is a concentration of the salt spray droplets, RH ∈[RH sat , 100);
RH sat =−0.0327T+76.049, in this formula, RH sat is a relative humidity of sodium chloride saturated deliquescence;
f
v
=
m
M
NaCl
N
NaCl
×
100
%
,
in this formula, m is an average of the salt spray concentration values measured by the two salt spray concentration monitors, and M NaCl is a molar mass of NaCl at 58.5 g/mol;
Step S 2 - 2 : based on the size distribution data of the salt spray droplets measured by the laser particle sensor, calculating an average radius of the salt spray droplets ā:
a
_
=
∑
1
K
R
i
×
N
i
∑
1
K
N
i
,
in this formula, R i is a median of the radius range of the i-th salt spray droplet;
Step S 3 , calculating an UV radiation intensity q t at a target position of the tested electrical equipment, wherein the tested electrical equipment is placed on the bottom surface of the main test chamber, comprising:
Step S 3 - 1 , calculating a transmission scattering coefficient σ λ tr :
σ
λ
tr
=
0.75
f
v
Q
s
tr
a
_
,
in this formula, Q s tr represents a scattering transmission efficiency factor, when ā≤1 μm, Q s tr =0.37, when 1 μm<ā<3 μm, Q s tr =0.35, when 3 μm≤ā<5 μm, Q s tr =0.32, when ā≥5 μm, Q s tr =0.3;
Step S 3 - 2 , calculating the UV radiation intensity q t at the target position of the tested electrical equipment according to following formulas:
q
t
=
I
inc
dir
T
dir
-
h
+
I
inc
dif
T
dif
-
h
,
T
dir
-
h
=
μ
i
μ
i
(
1
-
E
tr
)
+
(
1
+
E
tr
)
/
2
1
+
τ
tr
o
,
T
dif
-
h
=
1
1
+
τ
tr
o
,
τ
tr
o
=
β
tr
d
=
(
α
λ
+
σ
λ
tr
)
d
,
E
tr
=
exp
(
-
τ
tr
o
/
μ
i
)
.
In these formulas, T dir-h and T dif-h respectively represent a directional hemispherical transmittance and a hemispherical diffusion transmittance, a, is an incidence angle of the parallel UV light on a salt spray droplet layer, and α λ is 0°, μ i is a cosine value of the incident angle α λ , τ tr o is a total optical thickness of the salt spray droplet layer, d is a distance between the target position of the tested electrical equipment and the coplanar surface of each UV fluorescent lamp tube, β tr represents an extinction coefficient, and E tr is an intermediate parameter.
7 . The radiation intensity prediction method for the hot and humid marine environment simulation equipment according to claim 6 , further comprising Step S 4 , which is based on a difference between the UV radiation intensity q t calculated in step S 3 and a target UV radiation intensity, adjusting the UV radiation intensity q t at the target position of the tested electrical equipment to the target UV radiation intensity by correspondingly enhancing or weakening a luminous intensity of each UV fluorescent lamp tube.Join the waitlist — get patent alerts
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